<template>
    <div id="init-viewer-wrapper">
    </div>
</template>
  
<script>
export default {
    name: 'Clustering',
    components: {},
    mounted() {
        this.initViewer()
    },
    methods: {
        async initViewer() {
            Cesium.Ion.defaultAccessToken = "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJqdGkiOiIzM2RjYjJlOC01ZTQwLTQwODYtOTEwMy02M2U4OGEzYjQyNGUiLCJpZCI6MjI5NjUsInNjb3BlcyI6WyJhc3IiLCJnYyJdLCJpYXQiOjE1ODI0NTYwMzF9.VG2_T9ry8EnBWAh4msJ3s6m2jW_5hgAZQvfEQDh-WQs"
            window.viewer = new window.Cesium.Viewer("init-viewer-wrapper", {
                terrainProvider: new window.Cesium.CesiumTerrainProvider({
                    url: 'http://data.mars3d.cn/terrain',
                    requestWaterMask: true,
                    requestVertexNormals: true
                }),
                imageryProvider: new window.Cesium.ArcGisMapServerImageryProvider({
                    url: 'https://services.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer',
                }),
                sceneMode: window.Cesium.SceneMode.SCENE3D,
                vrButton: false,
                animation: false,
                baseLayerPicker: false,
                geocoder: false,
                timeline: false,
                fullscreenButton: false,
                homeButton: false,
                creditContainer: document.createElement('div'),
                infoBox: true,
                navigationHelpButton: false,
                sceneModePicker: false,
                scene3DOnly: true,
                skyBox: new window.Cesium.SkyBox({
                    sources: {
                        positiveX: require('@/assets/images/tycho2t3_80_px.jpg'),
                        negativeX: require('@/assets/images/tycho2t3_80_mx.jpg'),
                        positiveY: require('@/assets/images/tycho2t3_80_py.jpg'),
                        negativeY: require('@/assets/images/tycho2t3_80_my.jpg'),
                        positiveZ: require('@/assets/images/tycho2t3_80_pz.jpg'),
                        negativeZ: require('@/assets/images/tycho2t3_80_mz.jpg'),
                    }
                })
            });


            window.viewer.scene.globe.depthTestAgainstTerrain = true;
            let dataSource = await window.viewer.dataSources.add(
                Cesium.GeoJsonDataSource.load('/data/poi.json', {
                    clampToGround: true
                })
            );
            window.viewer.flyTo(dataSource)


            dataSource.clustering.enabled = true;
            dataSource.clustering.pixelRange = 15;
            dataSource.clustering.minimumClusterSize = 3;
            const pinBuilder = new Cesium.PinBuilder();
            dataSource.clustering.clusterEvent.addEventListener((clusteredEntities, cluster) => {
                let pinImg = pinBuilder
                    .fromText(cluster.label.text, Cesium.Color.RED, 48)
                    .toDataURL();
                cluster.label.show = false
                cluster.billboard.image = pinImg
                cluster.billboard.verticalOrigin = Cesium.VerticalOrigin.BOTTOM
                cluster.billboard.heightReference = Cesium.HeightReference.CLAMP_TO_GROUND
                cluster.billboard.show = true
            })
        }
    }
}
</script>
  
<style>
#init-viewer-wrapper {
    width: 100%;
    height: 100%;
}
</style>
  